A future tunnel between Helsinki and Tallinn?

Architect composite depiction of rail connection
Architect composite depiction (Sweco).

A preliminary feasibility study on a tunnel between the Finnish capital Helsinki and the Estonian capital of Tallinn concludes that the future construction of such a connection is worth more study.

A rail transport connection between the two cities would include the construction of a tunnel under the Gulf of Finland at a current cost estimate of 9 to 13 billion euros.

Source: YLE